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  <title>Description of label</title>
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  <meta name="description" content="Assign labels to vertices of g">
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<div><a href="../../index.html">Home</a> &gt;  <a href="../index.html">matgraph</a> &gt; <a href="index.html">@graph</a> &gt; label.m</div>

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<h1>label
</h1>

<h2><a name="_name"></a>PURPOSE <a href="#_top"><img alt="^" border="0" src="../../up.png"></a></h2>
<div class="box"><strong>Assign labels to vertices of g</strong></div>

<h2><a name="_synopsis"></a>SYNOPSIS <a href="#_top"><img alt="^" border="0" src="../../up.png"></a></h2>
<div class="box"><strong>function label(g,v,name) </strong></div>

<h2><a name="_description"></a>DESCRIPTION <a href="#_top"><img alt="^" border="0" src="../../up.png"></a></h2>
<div class="fragment"><pre class="comment"> Assign labels to vertices of g
 With no arguments, we assign default names for vertices (string versions
 of the vertex numbers)
 label(g,v,name) gives vertex v the name in the string name.
 label(g,vnamelist) assigns names to vertices in the cell array vlist</pre></div>

<!-- crossreference -->
<h2><a name="_cross"></a>CROSS-REFERENCE INFORMATION <a href="#_top"><img alt="^" border="0" src="../../up.png"></a></h2>
This function calls:
<ul style="list-style-image:url(../../matlabicon.gif)">
<li><a href="clear_labels.html" class="code" title="function clear_labels(g)">clear_labels</a>	clear_labels(g) --- delete all labels in g</li><li><a href="is_labeled.html" class="code" title="function yn = is_labeled(g)">is_labeled</a>	is_labeled(g) --- determine if there are labels on vertices.</li><li><a href="label.html" class="code" title="function label(g,v,name)">label</a>	Assign labels to vertices of g</li><li><a href="nv.html" class="code" title="function n = nv(g)">nv</a>	nv(g) --- number of vertices in g</li></ul>
This function is called by:
<ul style="list-style-image:url(../../matlabicon.gif)">
<li><a href="cartesian.html" class="code" title="function cartesian(g,h1,h2)">cartesian</a>	cartesian(g,h1,h2) --- overwrite g with the product of h1 and h2</li><li><a href="cayley.html" class="code" title="function cayley(g,perms,verbose)">cayley</a>	cayley(g,perms) -- create a Cayley graph (undirected)</li><li><a href="copy_labels.html" class="code" title="function copy_labels(g,h)">copy_labels</a>	copy_labels(g,h) --- copy labels from h to g</li><li><a href="dot.html" class="code" title="function dot(g,filename)">dot</a>	dot(g,filename) --- save graph for use by graphviz.</li><li><a href="draw_labels.html" class="code" title="function draw_labels(g,offset)">draw_labels</a>	draw_labels(g) --- add labels to a drawing of g</li><li><a href="induce.html" class="code" title="function induce(g,arg1,arg2)">induce</a>	induce --- create induced subgraphs</li><li><a href="label.html" class="code" title="function label(g,v,name)">label</a>	Assign labels to vertices of g</li><li><a href="load.html" class="code" title="function load(g,filename)">load</a>	load(g,filename) --- read a saved graph on disk</li><li><a href="shiftgraph.html" class="code" title="function shiftgraph(g,k,t)">shiftgraph</a>	shiftgraph(g,k,t) -- create a shiftgraph g based on t-tuples of k symbols</li><li><a href="sl2graph.html" class="code" title="function sl2graph(g,p)">sl2graph</a>	sl2graph(g,p) -- create an SL(2,p) graph</li></ul>
<!-- crossreference -->


<h2><a name="_source"></a>SOURCE CODE <a href="#_top"><img alt="^" border="0" src="../../up.png"></a></h2>
<div class="fragment"><pre>0001 <a name="_sub0" href="#_subfunctions" class="code">function label(g,v,name)</a>
0002 <span class="comment">% Assign labels to vertices of g</span>
0003 <span class="comment">% With no arguments, we assign default names for vertices (string versions</span>
0004 <span class="comment">% of the vertex numbers)</span>
0005 <span class="comment">% label(g,v,name) gives vertex v the name in the string name.</span>
0006 <span class="comment">% label(g,vnamelist) assigns names to vertices in the cell array vlist</span>
0007 
0008 
0009 <span class="keyword">global</span> GRAPH_MAGIC;
0010 
0011 n = <a href="nv.html" class="code" title="function n = nv(g)">nv</a>(g);
0012 i = g.idx;
0013 
0014 <span class="keyword">if</span> nargin == 1
0015     <a href="clear_labels.html" class="code" title="function clear_labels(g)">clear_labels</a>(g);
0016     GRAPH_MAGIC.graphs{i}.labels = cell(n,1);
0017     <span class="keyword">for</span> v=1:n
0018         GRAPH_MAGIC.graphs{i}.labels{v} = int2str(v);
0019     <span class="keyword">end</span>
0020     <span class="keyword">return</span>
0021 <span class="keyword">end</span>
0022 
0023 <span class="keyword">if</span> nargin == 2
0024     <a href="clear_labels.html" class="code" title="function clear_labels(g)">clear_labels</a>(g);
0025     GRAPH_MAGIC.graphs{i}.labels = v;
0026     <span class="keyword">return</span>    
0027 <span class="keyword">end</span>
0028 
0029 <span class="keyword">if</span> ~<a href="is_labeled.html" class="code" title="function yn = is_labeled(g)">is_labeled</a>(g)
0030     <a href="label.html" class="code" title="function label(g,v,name)">label</a>(g);
0031 <span class="keyword">end</span>
0032 
0033 <span class="keyword">if</span> (v&lt;0) || (v&gt;n)
0034     error(<span class="string">'No such vertex to label'</span>)
0035 <span class="keyword">end</span>
0036 
0037 GRAPH_MAGIC.graphs{i}.labels{v} = name;</pre></div>
<hr><address>Generated on Fri 30-Apr-2010 07:51:16 by <strong><a href="http://www.artefact.tk/software/matlab/m2html/">m2html</a></strong> &copy; 2003</address>
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